Method for activating at least a function on a chipset and chipset for the implementation of the method

摘要

The present invention concerns a method for activating a function of a chipset comprising at least a memory and a calculation module in charge of cryptographic operations, the memory containing at least a seed and the calculation module containing at least one cryptographic algorithm, this method comprising the steps of: - receiving at least one of a segmentation key, a global key and a global cryptographic algorithm selector; - transmitting at least two of : the seed, the received segmentation key, the global key and the global cryptographic algorithm selector to the calculation module, said seed, said received segmentation key, said global key and said global cryptographic algorithm selector being provided by at least two different entities; - generating in the calculation module, a temporary key by using one of said at least one cryptographic algorithm of the calculation module and at least two elements among the seed, the segmentation key, the global key and the global cryptographic algorithm selector; - receiving an activation message by the calculation module; - receiving an authentication code of said message by the calculation module, said message authentication code being computed using the temporary key; - verifying the authenticity of said received message by using the message authentication code and the temporary key; - if the received message is authentic, activating a corresponding function of the chipset; - if the received message is not authentic, denying the activation of said corresponding function of the chipset.